404 Page Not Found | Strikeout
In computer network communications, the HTTP 404, 404 not found, 404, 404 error, page not found or file not found error message is a hypertext transfer protocol (HTTP) standard response code, to indicate that the browser was able to communicate with a given server, but the server could not find what was requested. The error may also be used when a server does not wish to disclose whether it has the requested information.
404 Page Not Found | Strikeout
The website hosting server will typically generate a "404 Not Found" web page when a user attempts to follow a broken or dead link; hence the 404 error is one of the most recognizable errors encountered on the World Wide Web.
When communicating via HTTP, a server is required to respond to a request, such as a web browser request for a web page, with a numeric response code and an optional, mandatory, or disallowed (based upon the status code) message. In code 404, the first digit indicates a client error, such as a mistyped Uniform Resource Locator (URL). The following two digits indicate the specific error encountered. HTTP's use of three-digit codes is similar to the use of such codes in earlier protocols such as FTP and NNTP. At the HTTP level, a 404 response code is followed by a human-readable "reason phrase". The HTTP specification suggests the phrase "Not Found" and many web servers by default issue an HTML page that includes both the 404 code and the "Not Found" phrase.
A 404 error is often returned when pages have been moved or deleted. In the first case, it is better to employ URL mapping or URL redirection by returning a 301 Moved Permanently response, which can be configured in most server configuration files, or through URL rewriting; in the second case, a 410 Gone should be returned. Because these two options require special server configuration, most websites do not make use of them.
404 errors should not be confused with DNS errors, which appear when the given URL refers to a server name that does not exist. A 404 error indicates that the server itself was found, but that the server was not able to retrieve the requested page.
Some websites report a "not found" error by returning a standard web page with a "200 OK" response code, falsely reporting that the page loaded properly; this is known as a soft 404. The term "soft 404" was introduced in 2004 by Ziv Bar-Yossef et al.
Some proxy servers generate a 404 error when a 500-range error code would be more correct. If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead. This can confuse programs that expect and act on specific responses, as they can no longer easily distinguish between an absent web server and a missing web page on a web server that is present.
Web servers can typically be configured to display a customised 404 error page, including a more natural description, the parent site's branding, and sometimes a site map, a search form or 404-page widget. The protocol level phrase, which is hidden from the user, is rarely customized. Internet Explorer, however, will not display custom pages unless they are larger than 512 bytes, opting instead to display a "friendly" error page. Google Chrome included similar functionality, where the 404 is replaced with alternative suggestions generated by Google algorithms, if the page is under 512 bytes in size. Another problem is that if the page does not provide a favicon, and a separate custom 404-page exists, extra traffic and longer loading times will be generated on every page view.
Many organizations use 404 error pages as an opportunity to inject humor into what may otherwise be a serious website. For example, Metro UK shows a polar bear on a skateboard, and the web development agency Left Logic has a simple drawing program. During the 2015 UK general election campaign the main political parties all used their 404 pages to either take aim at political opponents or show relevant policies to potential supporters. In Europe, the NotFound project, created by multiple European organizations including Missing Children Europe and Child Focus, encourages site operators to add a snippet of code to serve customized 404 error pages which provide data about missing children.
A number of tools exist that crawl through a website to find pages that return 404 status codes. These tools can be helpful in finding links that exist within a particular website. The limitation of these tools is that they only find links within one particular website, and ignore 404s resulting from links on other websites. As a result, these tools miss out on 83% of the 404s on websites. One way around this is to find 404 errors by analyzing external links.
If you have moved all the way up to the website's home page, try to run a search for the information you're looking for. If the site doesn't have a search function, try navigating to the page you want using category links to dig deeper into the site.
If you use WordPress, 404 errors often pop up because of redirect conflicts or permalink issues. Fix broken links for individual pages or posts. Visit the WordPress dashboard and update permalink settings if it's a site-wide problem.
If the domain is still propagating, you may encounter a 404 error page. To solve it, you will need to wait until the propagation is complete. Usually, it takes a maximum of 24 hours until the DNS resolves.
The HTTP 404 Not Found response status code indicates that the server cannot find the requested resource. Links that lead to a 404 page are often called broken or dead links and can be subject to link rot.
You can display a custom 404 page to be more helpful to a user and provide guidance on what to do next. For example, for the Apache server, you can specify a path to a custom 404 page in an .htaccess file:
\n The HTTP 404 Not Found response status code indicates that the server cannot find the requested resource.\n Links that lead to a 404 page are often called broken or dead links and can be subject to link rot.\n
You know the page: you click on a link, but instead of getting the site you want, an error pops up indicating that the requested page is not available. Something along the lines of '404 Not Found'. A 404 error is the standardized HTTP status code. The message is sent from the webserver of an online presence, to the web browser (usually the client) that sent the HTTP request. The browser then displays this error code.
Having a standard 404 error page is better than having none at all, although a customized page is more preferred for several reasons. On the one hand, you can be sure that visitors receive an accurate HTTP status code: for example, if the requested content is no longer present on the site, this should be conveyed with the '410 Gone' message. The visitor then knows that this content has been permanently deleted.
On the other hand, you can provide a specially-designed error page containing related links (i.e. links to your homepage or subpages where the content overlaps that which the visitor originally requested). You could even add a search function for your website. By taking these extra measures and providing incentives, you might be able to prevent visitors from leaving your site straight after seeing the 404 code.
With a creative 404 message you may even find that visitors are more forgiving. Naturally they will be disappointed at not finding content they were promised, but an original or funny 404 page could make up for it. If done properly, error pages do have some potential.
Nearly every website has the potential to give you 404 errors. It's the easiest way to tell a user that they're in the wrong place. Even Business Insider has its own 404 pages, which display when you try to visit a page that doesn't exist.
If you're getting reports of 404 errors on a site that you manage, make sure that no pages have been deleted accidentally, and that all your links and buttons lead to the correct URLs. You can use free tools like Dead Link Checker to find your broken links and missing pages.
When users click on a link, they expect to land on a page that answers their questions or gives them the necessary information. For whatever reason, the page they land on returns a 404 message. In that case, what should they do next?
You can closely monitor your 404 pages by using tools such as Google Search Console or Screaming Frog. Make sure to monitor and fix 404 errors regularly. That helps ensure your website is properly crawled and indexed by Google and may help improve your overall SEO performance.
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404 is a status code that tells a web user that a requested page is not available. 404 and other response status codes are part of the web's Hypertext Transfer Protocol response codes. The 404 code means that a server could not find a client-requested webpage. Variations of the error message include "404 Error," "404 Page Not Found" and "The requested URL was not found."
404 error codes are generated when a user attempts to access a webpage that does not exist, has been moved, or has a dead or broken link. The 404 error code is one of the most frequent errors a web user encounters. 041b061a72